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Note 6 - Supplemental Balance Sheet Information - Composition of Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Cost	$ 19,748	$ 16,109
Accumulated Amortization	9,816	9,605
Net	9,932	6,504
Trademarks [Member]
Cost	3,405	3,405
Accumulated Amortization	0	0
Net	3,405	3,405
Customer Relationships [Member]
Cost	8,986	6,471
Accumulated Amortization	4,509	4,392
Net	4,477	2,079
Patented Technology [Member]
Cost	5,483	5,486
Accumulated Amortization	4,789	4,725
Net	694	761
Distributor Relationships [Member]
Cost	377	377
Accumulated Amortization	377	377
Net
Trade Names [Member]
Cost	1,497	370
Accumulated Amortization	141	111
Net	$ 1,356	$ 259

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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X

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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- Definition

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+ References

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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